Nextdoor, a social network that connects neighborhoods and communities, has raised $110 million in new funding from investors including Redpoint Ventures and Insight Venture Partners. The new investment values the company at about $1.1 billion. Nextdoor, which is now used by over 53,000 neighborhoods across the U.S., has been on an impressive growth trajectory; in less than three years (during which the company has closed four financings), its valuation has grown by about 650%. It raised $18.7 million at a $147 million valuation in July 2012. Additional company backers include Kleiner Perkins Caufield & Byers, Greylock Partners, Google Ventures, Benchmark Capital and Tiger Global Management.