Those 3 little dots are known as an ellipsis. Usage of the ellipsis has been going up for decades, and hasn’t peaked yet.
Technically, you’re supposed to use this for:
Ellipsis … is a series of dots that usually indicate an intentional omission of a word, sentence or whole section from the original text being quoted, and though necessary for syntactical construction, is not necessary for comprehension. Ellipses can also be used to indicate an unfinished thought or, at the end of a sentence, a trailing off into silence … When placed at the beginning or end of a sentence, the ellipsis can also inspire a feeling of melancholy or longing. The ellipsis calls for a slight pause in speech or any form of text, and can be used to suggest a tense or awkward momentary silence.
And here’s something I didn’t know:
The Chicago Manual of Style recommends that an ellipsis be formed by typing three periods, each with a space on both sides.
So all this time, I’ve been incorrectly typing … when I should be typing . . .
Hmmm . . .
Inspired by this link at Carpe Diem.