ShareThis has secured $23 million in Series C financing. In another development, the company acquired mobile social platform Socialize.

ShareThis’ new round of funding is led by T-Venture, the venture capital company of Deutsche Telekom, and includes new investors Harbourton and corporate funds represented by West Capital Advisors. Existing investors Blue Chip Venture Company, DFJ, Illinois Ventures, Matthew Pritzker Company, Mercury Fund and RPM Ventures participated. Bernhard Gold of T-Venture is joining ShareThis’ board.

ShareThis said it plans to use the funding for product development and market expansion. With this Series C round, ShareThis’ total funding is $54 million.