April Fools is a time when the internet goes nuts. It's great fun. Lots of attention to be won for the best pranksters. I've already had my Foursquare checkin at work try and pretend it wasn't going to count. Since that checkin was on an Android and it's too hard to screengrab on that OS I can't share with anyone.
LinkedIn's April Fools needs a bit of help to get noticed too. Try adding some new contacts today. You may well discover some interesting characters in the "People You May Know" section.