He added: "As so many of you have said over the last 48 hours, this is a unique place underpinned by one of the most vibrant and supportive communities on the internet - there's really nothing quite like it.
"Our pictures and words have come to mean so much to us individually, but the way our collective story touches a much wider audience is truly remarkable, and something I'll always be immensely proud of.
"I can't say any more at this stage, but I am optimistic the lights aren't about to go out and know many people are working hard behind the scenes to make sure they shine even more brightly in the future."
In a statement FRP said: "A sale of the assets will protect subscribers and ensure continuity of the service.
"FRP Advisory hopes to progress matters quickly and will update as soon as possible."
Blipfoto is a website where users document their lives daily with a single photo and some text.
It was founded in 2004 by Mr Tree and now reaches half a million people every month, in 175 countries.
In January, it entered a partnership with Polaroid. The website was then relaunched as Polaroid Blipfoto.