Timehop, one of my favorite free online services, is now available for the iPhone via a free downloadable app! If you’ve never heard of Timehop before, the service sends you a reminder every day of what you posted about on that day on different social networks. It reaches as far back I believe as 4 years — so as long as you’ve got something posted on the networks you’ve allowed Timehop to reach into, then it’ll give you something back. Quite effortless and really fun in my opinion.