What are the most common mistakes people made during link building?

Hi,
I want to know about the most possible mistakes during link building.
Please anybody tell me.

Chasing low quality volume links rather then high quality relivant links IMO...

1. Going after high PR links rather than links of higher relevance and authority

2. Over using the same anchors on all the links - which makes them look unnatural to Google and hence the chance of them being devalued.

3. Participating in various link schemes involving numerous spammy websites linking to 1000 irrelevant websites.

a lot of people don't look at relevance and PR at all.
everywhere where they can get a link, they place it.
That's bad.

Blaming the linkbuilder for poor performance... when their site stinks.

The first step in linkbuilding is offering content that other sites WANT to link to. You cannot talk anyone into one-way linking if your content sucks. If your content sucks... all you can do is pay or beg for links.

Bottomline: Offer content that attracts natural backlinks... Then it is easy to get backlinks, i.e. you only have to make sure that others are aware of your site and its content.

Get back links from same c Class IP and also you add these website on your site.

Well already lots of great opinions are here in this post.
Let me join the list.
In my opinion :

People always worried about from where they are getting the links, because some people thinks that back links from irrelevant and bad sites may harm the site. But any back link can't harm your site, it will carry something to your site.

Which are the sites that you are linking back, during link building we should concern about this.

But when you do reciprocal link building in that case this link can harm to your website.

Read the post carefully and try to understand what I have said.

Adding to what has been said so far... anyone can get links to the homepage... deeplinks however define ordered ranks.

The "most relevant page for the term should get the links"... it's the page that needs that anchor "mostly" and in most instances the homepage isn't the most relevant page for the term... the homepage usually has the least relevant information on it because it's trying to be "all things to everything"...

A jack of all and a master of none!

Too much to fast is a common problem.

Also not spreading out the keywords.

That's more myth than fact.

EXAMPLE: With any linkbait project that you have no control over who or how many domains link to you... that rate of links is almost always faster than anyone intentionally soliciting/acquiring links...

The "common problem" isn't "too fast" it's more general to a pattern of link ownership... if you make a deal with x company that has 1000 domains and 10,000,000 pages... that isn't the same a 10,000,000 different website owners linking in the same amount of time.

once again, great advise. but how to:

make sure that others are aware of your site and its content.

SBM besides digg does not seem to work, so what else is there?

Almost all Social Bookmarking resources work!

...you're just a little shortsighted.

If you're bookmarketing "ONLY" to get their link you are losing "BIG TIME".

People aren't membered because it's a great place to get a link.... they are membered because it's a great place to find solid resources to link to!

...course if your source that you bookmarked "SUCKS"... that's likely why it seem to not work.