Mark Zuckerberg’s dog is pretty famous, and cute, so the fact that both made their debut on social video site Viddy was pretty interesting news. Sure, simply signing up for a service doesn’t mean that there’s any intent to do anything other than play around, but given the recent Instagram acquisition, it’s hard not to wonder if Facebook is looking to swoop up any other promising startups.

It’s also clear that investors in apps like Viddy and Socialcam are positioning their investments to be “the Instagram of video”. Who can blame them with money like that flying around?

Once you put the posturing aside, both of these apps are seeing insane growth and both have Facebook to thank for it, all because of the Open Graph and Timeline.

One of Viddy’s investors, Alan Patricof of Greycroft Partners, spoke with Bloomberg today and touched on its growth saying:

(Viddy is) growing so fast, I have to keep refreshing to get myself up to date. I could swear I spoke at some place a few weeks ago, we were at 4 million.

Viddy has come a long way, now boasting 16M users, while Socialcam claims somewhere in the neighborhood of 20M. Social apps are definitely thriving with deeper integration with social networks like Facebook, and the more seamless it is to share content from these apps, the more users they’ll get.

Here’s the full interview with Patricof, where he thanks Zuck for joining Viddy:

Viddy for iOS

We know that Bono likes to get involved with tech as an investor, but we didn’t know that The Edge did as well.

Both have joined cloud filesharing service Dropbox as investors according to a tweet (and photo) from the company:

@Dropbox is excited to welcome Bono & The Edge as investors. Thanks for the support and look forward to great things! twitter.com/Dropbox/status…

— Dropbox (@Dropbox) April 2, 2012

The company has been adding millions of users as the idea of hosting your files on a third-party service is becoming an easier sell to consumers.

The addition of mobile apps for Dropbox has also helped illustrate how powerful it is to sync your files across multiple devices with little or no work needed.

Just a few weeks ago, Dropbox also launched a deep integration with Facebook, allowing you to share files and folders with your friends much easier.

Some of Bono’s other investments at Elevation Partners include; Facebook, Forbes, MarketShare, Move, and Yelp. His firm was also deeply involved with Palm.

It’s not known at this time the level of investment from Bono and The Edge, but we’ve reached out to Dropbox for more information and will keep you updated.

UPDATE: It appears that Bono and The Edge invested in the latest Dropbox round led by Index Ventures.