There are lots of web based
anonymus proxies..
r they secure...
I mean Can someone else still
see what we do
No they are not necisarily secure.
Yes, someone can still see what you do.
You're are using an unknown machine to do something. You have no idea how it is configured, or who is managing it. It is an unknown and should be treated that way.
infinite
Do a search for anonymous proxy test. There are several sites where you can use the proxy and then click on the test and it will show you what info it can retrieve about you.