Social media images: Amtrak train crashes in Philadelphia

• Study: More sex doesn't lead to greater happiness
• 'DWTS' partners caught on camera during Palm Springs getaway
• Large snake washes ashore on Florida beach
• Group lobbies for former slave Harriet Tubman to be on the $20 bill
• Orangutan dad adopts tiger cubs as his own

First news from the scene of an Amtrak train derailment came from social media, as passengers -- including an Associated Press reporter -- tweeted photos.

The train was on its way from Washington, D.C. to New York City on Tuesday night when it crashed, between 9:30 and 10 p.m. ET.