If you are casually playing with ellipses to spice up email or postings and such, three dots in a row like this … works fine (or any number of dots, for that matter).
But beware!
According to the Chicago Manual of Style, 14th edition, section 10.48, ellipsis “are usually separated from each other and from the text and any contiguous punctuation by 3-to-em spaces.”
A “3-to-em” space is 1/3 of an “em” space.
An em is a unit of linear measurement equal to the point size of the type. For example, if you are using 12-point type, an em would be 12 points long, or the same length as a character (in non-proportional type).
Admittedly, this rule is for typesetters and is a bit technical for the average novelist, but it brings up a point often neglected by many average writers, to wit:
Points of ellipsis need some kind of space between them.
I think that the rule of thumb for those using typewriters or word processors is to use one tap of the spacebar between the dots (and any text or contiguous punctuation).
I could go on with lots of examples, but I suspect that I may have lost all but the most dedicated to the craft of proper writing . . . <sigh> . . .