What is the story behind the logo?

The logo is a wordplay. Initially, when I decided to write my own RSS reader, I called it ureader, thinking about the u as a μ that was wrongly written by a native English speaker. Later I replaced the u in the name with mu, but thinking about this mu not as as the greek letter, but as the Japanese 無. Later I found that the usocial.me domain was available and I thought this was way cooler than musocial.me, so I switched from mu back to u in the name while keeping the mu logo. Funny enough, this character is also read in Mandarin Chinese as wu, so it works.

Also, the logo looks to me a lot like a walled garden seen from outside. As people read more blogs and listen more to podcasts, they step out of the walled garden social networks.