Bridge funding is a round of investment that is a "bridge" between very early seed funding (angel investing) and Series A funding, which is the first round of venture capital (VC) financing.
In the late 90s, technology startups could build an interesting proof of concept, often on a shoestring (loans from family and friends), and get Series A funding.
Since the tech bubble popped in 2000-2001, VCs have been smarter, demanding that the company have a working product, a feasible operating model, and serious, credible backers.
So an entire industry of angel investing has sprung up since then, facilitated by US legislation passed in 2012-2015, which enabled companies to get angel investors through online investing platforms such as FundersClub, Angelist, Crowdfunder, Microventures, etc.
Each of these sites/platforms has its own community and investing styles and it may be worth registering at all of them if you are interested in dipping your toe into this type of high-risk/high-reward investing. The failure rate of early stage companies is >75%. But when they succeed....
A widely touted success story of FundersClub is Coinbase, which started in the Y Combinator. In 2012, Coinbase got $600k in seed funding at FundersClub. One year ago, it was valued at $400M:
http://www.bloomberg.com/news/articles/2015-01-20/coinbase-said-to-be-valued-at-more-than-400-million-in-fundingOf course, this is after three rounds of VC funding, but that initial seed investment has probably returned several thousand per cent since 2012.
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The "get $100 to invest offer" is real. Note: Typically, the minimum investment in a company at FundersClub is $3-5K.
If you claim me as a referrer, then I get $100 to invest, and so do you.
Since you already registered at the site, it may be too late to use me as a referrer. But you can extend the offer to your friends.