No, there is no extra cost for the Social Plus data.
Any remaining data will automatically expire and will not be carried over.
Etisalat follows a uniform data allowance configuration across its packages, and your data units will be based on the below conversion:
1GB = 1000MB; 1MB = 1000KB; 1KB = 1024Bytes
When consuming data from a data package, your allowance will be deducted on the basis of 30KB increments. To prevent customer from accidental data usage, Pay-as-You-Go data is blocked by default incase the Pay-as-You-Go Data is unblocked by customer, usages will be rated at 1KB pulses.