@naveen, your site might in sandbox period, though many people do not believe in sandbox but according to me, it's pretty logical to have new sites in sandbox period where google can test out the sites. In short, from seeing this, I do not see any reason to be worried of.
yes, I agree. He must not have tried any blackhat methods. But Google sometimes do such things with new sites. And after that, the site will appear in search result for old keywords, but will go down.
Yea, that is called Sandbox. But apart from that let me clear some basics about the new sites getting good amount links and the results in the search ranking.
Scenario 1:
You have a 2 month old tech blog with good stuff on it, you post some exclusive stuff, which gets you good amount of links. Say, in 2 months you get 100 quality 1 way links, logically these are too many links in such a short period of time BUT this is possible as the links are related to your site's theme and are from geniune sites (no bad neighbourhood). So google is never gonna ban your site, infact it will get the site ranking up and google will crawl your site more frequently.
Scenario 2:
You have a 2 month old tech blog, you have a links section where you have linked to various non-tech related sites. (4-5 is ok, I am talking about whole resources section) and you are getting many links from various non-tech related sites. Google will again not ban you but it will simply give less weight to those links and your site's position won't change.
Scenario 3:
You have a 2 month old tech blog, a clean site with good stuff. But you have got backlinks from various adult sites, med sites etc.. Google will again not ban you but it won't give importance to your site as well as to those links. (This will be alomsot same as Scenario 2)
Scenario 4:
You have a 2 month old tech blog, you play around with blackhat techniques, play with fake redirects, cloaking etc.. Now Google is pretty smart here and it will simply kick you out of the search engine. Now there might be few blackhat methods which might cheat google and get good ranking but these are not going to work for long time, some or other day Google will find it out and kick your site. (Or you have to be aware about Blackhat stuff and keep on roating the techniques)
I hope this clears up the basic of SE stuff.
Also, Google is not some magical stuff. Google thinks like Human, so we need to think like Google not like any bot
Regards,
Deep