As marriages go, this one's starting off with plenty of caveats—and expletives.

Following news that aging Internet corporation Yahoo is paying $1.1 billion for Tumblr, the six-year-old blogging service popular with young people, Tumblr CEO David Karp vowed in a company blog post that "we're not turning purple." He promised "we won't let you down" amid concerns about potential culture clashes between the two companies.

(Laurent Gillieron/AP) (Laurent Gillieron/AP)

Yahoo's Marissa Mayer, meanwhile, promised the young employees (on Tumblr, where else?) that "we won't screw it up." And in what was surely both a moment of who-cares enthusiasm and a carefully scripted way of proving "see, I'm still cool, guys," Karp closed his blog post with a particularly exuberant expletive.

Because it's not every day a CEO signs off with a "F--- yeah" when publicly commenting about a merger, we're posting the full memo here:

Everyone, I’m elated to tell you that Tumblr will be joining Yahoo.

Before touching on how awesome this is, let me try to allay any concerns: We’re not turning purple. Our headquarters isn’t moving. Our team isn’t changing. Our roadmap isn’t changing. And our mission – to empower creators to make their best work and get it in front of the audience they deserve – certainly isn’t changing.

So what’s new? Simply, Tumblr gets better faster. The work ahead of us remains the same – and we still have a long way to go! – but with more resources to draw from.

Yahoo is the original Internet company, and Marissa and her team share our dream to make the Internet the ultimate creative canvas. I couldn’t be more excited to have her help. We also share a vision for Tumblr’s business that doesn’t compromise the community and product we love. Plus both our logos end with punctuation!

As always, everything that Tumblr is, we owe to this unbelievable community. We won’t let you down.

[F---] yeah,

Read also:

Marissa Mayer is no enigma

Yahoo, Tumblr and the creativity-failure nexus