Microcosm - 2nd Seedrs crowd-funding round

We are selling ourselves to you, investors and users, to site admins, and to VCs.

Because the audiences overlap, and the communications overlap.

Where possible (e.g the Seedrs listing), you can tailor the message to the audience. Where that's not possible, you should target your communication to your most important constituents. In time, I expect this will be existing (and potential) forum admins but perhaps it's still investors/VCs for now?

"Communities, reimagined".

Is that magical enough?

If you're going to go big, why restrict yourself to synonyms of discussion board?

Your Internet, reimagined
Your interests, online

Bit salesey - though might work for a larger target audience when you have more scale.

For the Seedrs listing, it might be better to go with something more descriptive:

Connecting like-minded folk online

Though the Seedrs strap line looks like it can be quite long, so perhaps a padded out version of the infographic text?

As others have said--and I think you have concluded?--I don't think you should reference tumblr in your strap line as it instantly puts you in the shadow of that company. It served its purpose, but it's time to move on.

Well... this is the graphic going at the top of the listing.

This is very helpful--definitely the best way to get your point across succinctly.

However it doesn't distinguish between points (you and your interests) and vectors (ways to engage). In addition, what are you engaging with, communities, or your interests? In practice, it's communities, but they only serve as a locus for your interests. Given that "community" is ambiguous, I'd drop it in favour of "interests" only.

Semantically, I think something like the following works better:
Connecting You
To your interests
In ways that matter

But this is harder to show graphically--the best I can think of in 2D is having "you" on the left, "interests" on the right and "ways of engaging" in the middle but with the text centered below so that it reads in the right order, but it's not elegant. I can see it making for a nifty animated pencil illustration though, perhaps taking cues from parts of the video Apple used to introduce their developers' conference (e.g. from around 50 seconds in):

video