The spider actually has 3 spinnerets. They each secrete their own compounds. The spider is able to blend these to create a whole range of web types. These not only vary in stickiness, they also vary in thickness, density and strength.
Besides the spokes and the sticky stuff, there's also the lines they run out to adjoining natural supports, then there's the silk they wrap their prey in, the silk they use to make a nest for their young and they can even make parascending chutes to sail on the wind. All of these have different characteristics but the spider can knock them out at will.
I like spiders.
I've just found another idiot that has blocked me. She answered this question, thanks for exposing another coward. :)
Her answer has been deleted, so I must have been right. :)
Their feet are designed not to get caught up. But spiders can get caught up in their own webs if they lose their footing and fall over into it. But you will not see that very often.
spiders don't come in contact with their own webs, they have small hairs on the tips of their legs, that's what prevents them from sticking. plus, they clean themselves on a regular basis