In case you hadn't realized, today is April 1, and that means April Fool's Day. In the past that might mean a practical joke from from someone at the office or a friend, but these days, big companies, particularly tech and social media sites, are pulling out all the stops to make your April Fool's Day an hilarious one. Let's check out some of the best tricks so far:

I keep an eye on my Klout score and watch for major shifts in score, one way or the other. They can sometimes indicate that I'm neglecting a network, or perhaps some of my recent activity is being better received. I recently noticed a 4 point uptick in my score and that is definitely out of the ordinary. I didn't see any major changes though in my online activity, nor did I find any evidence or announcements from Klout on algorithm changes, so the new score was a mystery. Until today.

Klout announced in an official blog post that Instagram activity is now impacting your Klout Score. You may have already connected your Instagram account, and the changes are being rolled out gradually so some, like me, may have already noticed a change.

What happens when you are the evangelist for a brand and you ignite an Internet controversy while representing that brand? You get fired.

Adria Richards was a brand advocate for SendGrid. She was attending a Python conference, one of many she had attended on behalf of her company, and according to her blog post, had heard more than her fair share of sexual jokes. At one point during a presentation, she decided to take action in the form of a Tweet that she knew would be seen by conference organizers. Read more »

In an official blog post, Klout has announced that it is open for business(es). According to the announcement, "Businesses will be able to look at an easy-to-read dashboard that tells you, at-a-glance, whether you are engaging your influencers on the networks where they are most actively exerting their influence and on which Klout Score ranges you could stand to amp up your efforts. Most importantly, Klout can tell you which topics your audience influences others on, helping you maximize your content efforts to drive consideration for your brand."

Over the weekend, Flickr released an update for their mobile app that brought complete hashtag support to the image-sharing network. This seems liks a smart move from Yahoo! CEO Marissa Mayer, and is one within a series of updates to Flickr which have demonstrated Yahoo's commitment to strengthening their position in the picture and social-sharing circle.