Employers in California and Illinois will be prohibited from demanding access to workers' password-protected social networking accounts and teachers in Oregon will be required to report suspected student bullies thanks to new laws taking effect in 2013.
In all, more than 400 measures were enacted at the state level during 2012 and will become law in the new year, according to the National Conference of State Legislatures (NCSL).
Some of the statutes, which deal with everything from consumer protection to gun control and healthcare, take effect at the stroke of midnight. Others will not kick in until later in the year.
The raft of measures includes a new abortion restriction in New Hampshire, public-employee pension reform in California and Alabama, same-sex marriage in Maryland, and a requirement that private insurers in Alaska cover autism in kids and young adults, NCSL said.
In New Hampshire, a rarely used form of late-term abortion will become illegal except to save the life of the mother - and even then only if two doctors from separate hospitals certify the procedure is medically necessary.
John Lynch, the state's outgoing Democratic governor, had vetoed the measure, saying it would threaten the lives of women in rural areas. But the state's Republican-controlled legislature later overrode him.
In California and Illinois, laws that take effect at 12:01 a.m. local time will make it illegal for bosses to request social networking passwords or non-public online account information from their employees or job applicants.
Michigan's Republican Governor Rick Snyder signed a similar measure into law earlier this month that took effect immediately. The Michigan law also penalizes educational institutions for dismissing or failing to admit a student who does not provide passwords and other account information used to access private internet and email accounts, including social networks like Facebook and Twitter.
But workers and job seekers in all three states will still need to be careful what they post online: Employers may continue to use publicly available social networking information. So inappropriate pictures, tweets and other social media indiscretions can still come back to haunt them.
Gun violence - in places where it's all too common, such as Chicago, and in places where it's unexpected, such as Sandy Hook Elementary School in Newtown, Connecticut - was big news in 2012. But only a handful of new state firearms laws are set to take effect in 2013.
In Michigan, the definition of a "pistol" under the law will now include any firearm less than 26 inches in length. The new definition encompasses some rifles with folding stocks and will make the weapons subject to the same restrictions as pistols.
In Illinois, certain guns currently regulated by state law, including paintball guns, will be excluded from the definition of a firearm and participants in military re-enactments will be exempt from some weapons laws.
Another big story in 2012 was the effort by lawmakers in a number of cash-strapped states to put their public employee pension funds on a sounder financial footing.
In California and Alabama, reforms designed to begin to address the unfunded liabilities of those retirement systems will take effect in 2013.
Among the other new laws on the books in 2013:
* In California, prison workers and peace officers will now be prohibited from having sex with inmates and prisoners in transport.
* In Illinois, sex offenders will be prohibited from distributing candy on Halloween, or playing Santa or the Easter Bunny.
* In Oregon, employers won't be allowed to advertise a job vacancy if they won't consider applicants who are currently out of work.
* In Kentucky, residents will be prohibited from releasing feral or wild hogs back into the wild and Illinois will ban the possession and sale of shark fins.
* And in Florida, the term "motor vehicle" will no longer apply to the specialized all-terrain vehicles with over-sized tires known as "swamp buggies" that are popular in some parts of the state.
Facebook's Instagram use dived after photo fiasco
Facebook Inc's Instagram lost almost a quarter of its daily users a week after it rolled out and then withdrew policy changes that incensed users who feared the photo-sharing service would use their pictures without compensation.
Instagram, which Facebook bought for $715 million this year, saw the number of daily active users who accessed the service via Facebook bottom out at 12.4 million as of Friday, versus a peak of 16.4 million last week, according to data compiled by online tracker AppData.
The popular app, which allows people to add filters and effects to photos and share them over the Internet or smartphones, experienced the drop over the brief, often-volatile holiday period.
Other popular apps also saw slippage in usage, and some were more pronounced. Yelp (YELP.N), for instance, saw daily active users -- again via Facebook -- slide to a weekly low of half a million on Thursday, from a high of 820,000 one week ago.
Instagram disputed the AppData survey, which was compiled from users that have linked the photo service to their own Facebook accounts, historically between 20 and 30 per cent of Instagram members.
"This data is inaccurate. We continue to see strong and steady growth in both registered and active users of Instagram," a spokeswoman said in an emailed statement on Friday.
Looking out over a broader timeframe, Instagram's monthly active users edged up to 43.6 million as of Friday, an increase of 1.7 million over the past seven days, according to AppData.
"We'll have to monitor the data over the coming weeks to gain perspective on trends in Instagram's performance," AppData marketing manager Ashley Taylor Anderson said in an email.
The sharp slide in activity highlighted by AppData was bound to draw attention on the heels of the controversial revision to Instagram's terms of service that, among other things, allowed an advertiser to pay Instagram "to display your username, likeness, photos (along with any associated metadata)" without compensation.
The subsequent public outrage prompted an apology from Instagram founder Kevin Systrom. Last week, a California Instagram user sued the company for breach of contract and other claims, in what may have been the first civil lawsuit to stem from the controversial change.
Instagram subsequently reverted to some of its original language.
The move renewed debate about how much control over personal data users must give up to live and participate in a world steeped in social media.
Analysts say Facebook, the world's largest social network, was laying the groundwork to begin generating advertising revenue, by giving marketers the right to display profile pictures and other personal information, such as who users follow in advertisements.
Its shares closed down 13 cents or 0.5 per cent at $25.91 on the Nasdaq, in line with the broader market.