All love an informal conversation (chat) and make new friends on the computer. However, this method of communication will do very little to improve your language proficiency.
There are many logical reasons for this. First, learning is the result of your brain responding to a stimulation by physically creating new connections. The more your brain is challenged and the more you will learn. Second, not only English is not spoken the way that it is written, it is spoken with many different accents that vary from easy (USA) to difficult (UK). The only way to deal with these problems is to familiarize yourself with spoken (accent) and written (different than spoken) English at the same time.
Watching documentaries in English with their English subtitles together will significantly challenge your brain and allow you to achieve significant learning in a short time, especially if the topic is of any interest to you. Fifteen to twenty minutes a day two or three times a week is all that you really need.
It does not matter how much or little English you have as long as you are willing to try this method.
English usually presents 4 major difficulties to foreign students:
1) it is not spoken like it is written,
2) stress-timed versus syllable-timed,
3) accents vary greatly from easy (U.S.A.) to daunting (U.K.),
4) understanding is more difficult when spoken by a non-native English speakers.
I found that documentaries with their subtitles (both in English) are a great way to:
a) use the language to explore the culture,
b) the culture to refine the language, and
c) to narrow the gap between the spoken and the written language. See for yourself: