According to me Google sandbox is used as probation period for new sites, the sites those domain age is new. Despite some differences in terminology, the sandbox as an abstraction for a specific sum of parts in Google's larger algorithm is almost certainly existent.
Here few facts that Sites most affected by the sandbox effect usually appear to fit one or more of the following key criteria:
1. Newly established
2. Target a highly competitive and/or commercial industry
3. Have attempted optimization, especially link building
But according to me the number one has to be true, otherwise you can label virtually any aspect of Google's algorithm that depend rankings the sandbox, and the discussion would become too general.
Google sandbox period is variable ranging from 3 months to indefinite, the typical range though seems around 6-9 months, and one Google engineer has reportedly stated the actual range is 6-12 months.
Here are few tips to avoid or break out the sandbox.
* Buy old domains—Even if a domain is low on inbound links, the age factor will almost certainly be enough for it to have expired the sandbox; typically a year is good age to ensure a domain is sandbox free.
* Buy recently expired domains—You can take domain those are very recently expired domains can avoid a fresh sandbox cycle. A good measure might be domains expired but still indexed in Google.
* Collect the low competitor keyword—While your site in sandboxed you aren't going to rank well for competitive terms, but you may be able rank for low traffic ones. Large quantities of low traffic terms can be just as rewarding, and if you target the right ones you'll be strengthening the theme of your site for when your more competitive terms are freed from the sandbox.
* Buy your way in—Irregardless of sandbox status, you should almost always consider doing at least one PPC campaign for each of your targeted terms, in order to estimate the ROI before spending resources targeting terms organically.
* Explore non-Google traffic sources—Getting sandboxed clearly illustrates the danger of putting your eggs in one basket. Consider using your time in the sandbox to explore and make full use of other sources of targeted traffic; learn to survive without being at the whim of Google.
* Use sub domain from developed site—According to a few experts; since sandboxing appears to be based on 2nd level domain, hosting your site on a sub domain of an already established domain will avoid the sandbox. If you redirect all pages to the new domain once the site appears thoroughly indexed; it should reportedly maintain a non-sandboxed status.
* Get trusted links—Another way to get escape from Google sandbox, try to get trusted links you can say high quality authoritative link. The most often cited source for links capable of freeing a site are high profile news sites; .gov, and .edu sites; and dmoz.org. That is method can immediately free you from the sandbox. At least one Google engineer is reported to have supported the theory that high quality back links can negate the sandbox.