Today's the day for Twitter to go Pitch Wild. From 8 am to 8 pm EST prepublished authors are pitching their novels with only 280 characters. For more info check out their website here.
Word of caution:
Always research inquiring parties. Many vanity/predatory publishing houses prey on naive writers. Self publishing is where the author maintains control and foots the bill but vanity publishing is where they get control while you foot the bill.