On Thursday afternoon, Marc Andreessen un-quit Twitter after almost five months of absence. The All-Star venture capitalist tweeted an offer to answer questions for $20 a pop, with all proceeds going to Black Girls Code, a community outreach organization that aims to help girls of color excel in STEM fields.

Technically, you don't have to ask Andreessen a question -- any message that garners a response will cost $20. You have to wonder how many startup pitches Andreessen will find in his inbox.

Like the savvy businessman-cum-Internet celebrity he is, Andreessen is working multiple angles here. First, he's supporting a good cause, obviously. Andreessen's venture capital firm led the Series B round of funding for 21.co, the platform that he is using to receive the paid messages. Andreessen's partner, Ben Horowitz, recently did a similar paid ask-me-anything session and raised $1,350 for Black Girls Code in a couple days.

Then there's the fact that Andreessen's reputation could use a little polish when it comes to race and diversity.

Is Andreessen back to tweeting actively? Let's hope so -- it was so entertaining.