The sentiment behind PrayerChains is admirable, however...
<p>
There is no <b>scriptural</b> basis for PrayerChains .
<p>
 Agreement <b>is</b> scriptural - Matthew 18:19 
<p>
However it is not by <i>vain repetitions</i> that God is petitioned - Matthew 6:7 
<p>
The scriptural way to Pray is clearly spelled out by our Lord Jesus . - 
<dir>
 Mark 11:24 <br><i>
Therefore I say unto you, What things soever ye Desire , when ye Pray , Believe that ye Receive them, and ye <b>shall</b> have them.</i>
</dir>
<p>
So, we are to simply Ask and Believe with the expectation that the answer will Manifest .
<p>
There is also a negative connotation to the word ~chain~.
<p>
A chain is only as good as its weakest link.
<p>
Is the chain strong enough?
<p>
Is the chain long enough?
<p>
No, we don`t need a chain to ~move~ God .  We need to ask our Heavenly Father believing in His Love and Grace by which all our needs are met.
<p>
If that doesn`t seem like enough, you need a Revelation of God`s Love and Grace .  It is that awareness that produces Faith with Works (results).