To make the pitching process better for everyone, Muck Rack limits pitches to 300 characters and demands that pitches be relevant to the journalist's beat.
Do not send a pitch unless you're sure the story relates to the journalist's beat. See their profile page if you haven't already to be sure. Sending irrelevant pitches will affect your reputation.
Here's how we might pitch Muck Rack (very meta) in only 265 characters:
Here's a pitch adapted from a post David Pogue wrote with many 300 or less character pitches. This one's only 212 characters: