Cactus Game Design Message Boards

Sure.  Of the ones listed Boo.com is (I believe) the only one that is defunct.

In March of 2007, management made the decision to shutdown the operations of both its computer games and VoIP telephony businesses.  On September 29, 2008, theglobe.com sold the business and substantially all of the assets of its Tralliance Corporation subsidiary to Tralliance Registry Management Company LLC, a private entity controlled by Michael S. Egan, theglobe.com's Chairman and Chief Executive Officer... Immediately following the sale of the business and substantially all of the assets of its Tralliance Corporation subsidiary, theglobe.com  became a shell company with no significant assets or operations, and has no source of revenue other than revenue related to the “net revenue” earn-out arrangement with Tralliance Registry Management.

As of December 17, 2008, TLC closed its online store, leaving their products to be found at retail stores and other online distributors.

Additionally, TLC sells/sold computer games, theglobe offered content publication, boo sold brand name fashion clothes and infospace is a meta-search engine.  All of these examples provide a service beyond the capacity to send or receive plus-ones, and the ones that did not offer a tangible product rely(ed) on advertising revenue for their business model.  They are not examples of thumb-up as an economic model, but the sale of advertising space like a newspaper or magazine.