To ensure success among your many options, make sure you have at least a general idea of what you're looking for in a partner, and what you are offering them too.
(For more on those topics, see here, here, and here).
Generally, a few short emails or quick conversations will suffice.
As a result, it is harder to evaluate a potential match online.
Also, some of the cues and features that build attraction (like touching) cannot be accomplished through a computer.
Instead, narrow your search to a small location, or a certain set of "must have" features.
After your narrow it down, rather than just "shopping", talk to those who make the list.