<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION FROM EFUSION, INC.'S
UNAUDITED INTERIM FINANCIAL STATEMENTS (JUNE 30, 2000) AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<CASH> 13,710,878
<SECURITIES> 0
<RECEIVABLES> 297,439
<ALLOWANCES> 0
<INVENTORY> 308,454
<CURRENT-ASSETS> 14,553,601
<PP&E> 3,732,595
<DEPRECIATION> 1,592,874
<TOTAL-ASSETS> 16,693,322
<CURRENT-LIABILITIES> 1,019,973
<BONDS> 91,760
37,546,990
4,429
<COMMON> 4,341
<OTHER-SE> 13,772,788
<TOTAL-LIABILITY-AND-EQUITY> 16,693,322
<SALES> 236,045
<TOTAL-REVENUES> 307,575
<CGS> 65,449
<TOTAL-COSTS> 1,153,346
<OTHER-EXPENSES> 8,252,883
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 20,758
<INCOME-PRETAX> (8,889,764)
<INCOME-TAX> 0
<INCOME-CONTINUING> (8,889,764)
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (8,889,764)
<EPS-BASIC> (1.81)
<EPS-DILUTED> (1.81)
</TABLE>