in just the last few years FINCEN has tightened its grip on the amt of USD's that can be tx'd out of the USA w/o being reported. i know this b/c of my GoldMoney acct. i think the threshold now is $50K (it could be 10K) whereas before there either wasn't one or it was much higher.
also nowadays banks within the USA are required to report any tx's over $10K which also is much lower than it used to be.
Yes, the amount that can be carried on your person for international travel into and out of the US is $10k. The restrictions will be getting tighter, but of course this isn't the sort of information that makes the front page news.
How? Leveraging attention economy?

I'm somewhat active on Diaspora, I'll share good proposals if someone has any.
Kind of, lol

Awareness of alternatives is the first stage. Those aware of Bitcoin are likely to look for something that standardizes its use; if that's Diaspora, it will be the go-to just as Mt. Gox is the primary foreign exchange. From the Diaspora side, adding functionality for BTC payments could be extremely beneficial to developing nations (and anywhere else) in providing a relatively stable alternative to their own economic uncertainties that doesn't rely on government mismanagement of a regional money supply - the fact that Bitcoin is used as the underlying system would be a boon to that economic system.
Something as simple as adding a field for your Bitcoin address (similar to other services that assign a BTC address with a normal HTTP URL) and well-placed buttons similar to the "Pay with PayPal" ones (maybe "Buy with Bitcoin") could garner a lot of curiosity, certainly enough to get some people trying it out. Beyond that, an API-based connection with the major exchanges would allow for seamless means of obtaining Bitcoins through localized currencies.
I was intrigued by Diaspora when it first appeared, and have been keeping it in mind - there's a lot of potential, and it could genuinely rival Facebook (even though the two networks are distinct, there's a largely overlapping appeal). The additional functionality from the Bitcoin system affords even greater individual control and freedom; it may even force other networks to include Bitcoin.
The
Bitcoinjs project has been making steady progress toward reducing reliance upon a locally-installed client. I'm working on an alternative to the current wallet method of storing keys, so losing a wallet won't necessarily be an issue anymore. Several other developments are coming along that should make it easier to integrate and use Bitcoin within a system such as Diaspora.