Rajan, Article spinning is very easy using synonyms from any dictionary database. Even rearanging sentences sometimes is hard for robotic software to detect it.
BTW: If you are on oDesk, you probably see very often offers like this one:
Need 100 articles for BMR ( Very Urgent )
Fixed-Price - Est. Budget: $25.00 - Posted about an hour ago
I need a good blog/article writer IDEALLY with experience of using Build My Rank. If not no worries I can train.
Each blog/article needs to be 155-175 words, readable and keyworded. You will then need to submit it. If it's rejected then you need to rewrite.
I would like to see examples of work, and a ***PRICE PER BlOG/ARTICLE*** submitted... Please then give me your bid for 50 x 155 word articles.
For 25 US dollars, noone will write 100 short articles URGENTLY. Everything is copy&pasted from Wikipedia and other sources and then spun with automatic software that does it.